There's no way DDG can outbid Google or Bing. Also, it's not the default search where all the money is so they probably didn't have to beat out the big dogs to get into the list.
Surely the minute DDG starts costing them revenue then Google, et al., will simply cut them off from using their search results (eg via !) and substantially reduce the utility of DDG?
I'm not commenting on your deal specifically, but NDA-protected deals in general: let's say, 50 or 100 years from now, historians want to know all the details of various deals made between companies, to better understand the nature of the market in which we now exist. Is there any way for them to find out, or will these details be forever lost?
I know it's sensitive business information but any information you can provide would be great.